Grinder attachment for electrical food mixers



Oct. 30, 1951 H. WOLBAUM 2,573,377 GRINDER ATTACHMENT FOR ELECTRICAL FOOD MIXERS Filed Oct. 27, 1950 2 SHEETSSHEET 1 FIG. 2

INVEN TOR. IVA/Pay 14 01. 4940M BY Oct. 30, 1951 H. WOLBAUM GRINDER ATTACHMENT FOR ELECTRICAL FOOD MIXERS Filed Oct. 27. 1950 2 SHEETSQ-SHEET 2 34 T 30 as 1 Z3 19 FIG 1 I Z0 INVENTOR. HARP) W04 aa 4144 BY l atented Get. 30, 1951 GRINDER ATTACHMENT iron ELECTRICAL FOOD MIXERS Harry Wol baum, Braddock, yak. Application Octob r-27, 1950, SerialNo. 192,496

This invention relates to :a grinding apparatus,

and more particularly to. a grinder for iattache.

ment 'to an electric foodmixer.

An object of this invention is to .provide :a grinder which is particularly adapted for attachment to a horizontally or vertically disposed power take-off of a conventional electric food mixer with speed and facility.

Another object of this invention is to provide a grinder for attachment to an electric foodmixer which is particularly useful for the sharpening of small tools, such as knives, scissors; surgical and dental instruments, and the like.

'A further object of this invention is to provide a grinder for attachment to an electric food mixer which is extremely durable yet light and compact, and is easily attachable to the power take-01f of the electric food mixer.

A still further object of this invention is to provide a grinder for attachment to an electric food mixer which is relatively simple in structure and cheap to manufacture.

The above and still further objects, and advantages of the present invention will become apparent upon consideration ofthe, following "detailed description of the inventionwhen-taken in conjunction with the following drawings, wherein:

Figure 1 is an elevational view of the grinder attachment of the present invention, shown-con nected to 'a horizontally disposed power takeofi of a conventional electric food mixer;

Figure 2 is an elevational view of the grinder attachment of the present invention shown. c-onnected to a vertically disposed power take-61f of a conventional electric food mixer;

Figure 3 is an enlarged elevational view taken along the line 3--3 of Figure 1, with partsrbrcke'n away; and

Figure 4 is a .sectional viewwtaken along-' tlie line 4-4 of Figure 3.

Referring now more particularly to the drawings, wherein like reference numerals have been used throughout the several views to designate like parts-there is shown the grinder attachment of the present invention, generally designated by the reference numeral In, which is particularly adapted for attachment to either the horizontally disposed power take-01f l2 of the conventional electric food mixer I l or to the vertically disposed power take-off I3 of the mixer I I.

The grinder attachment comprises a flat cylindrical housing [5 having a closed end I6 and an open end l7. Disposed axially of the closed end I6 of the housing I5 is a hollow, cylindrical 1mm. (01. si 241) v Y extension 18 which has one end :secured 'the bottom '46 in communication therewith. Eli-lositioned longitudinally within the extension I18 is a plain bearing sleeve 49 which is secured within -the ex tension I 8.

Rotatably supported within the bearingsleeve [9' is a plain-rive shaft 20 which has .one end projecting beyond the free end of the extension l'8- 'and squared, as designated by the :refe-rence numeral 21, for con-nection within the complee mentary socket of either power take-off of the mixer 11-. -As clearly show-n' in Figure 4, 1the-end of the-drive -shaft Zll-remote from the squared end-2-lterminates in athe housingw and is provided with an axial -bore 22 which terminates adjacent to and spaced from the end thereof receive'd-with in'the housing 1 5. A

Positioned within the housing i5 is a crown gear 23 which has one face disposed in confronting relation with respect -to the lclose'd L end I 6 -of the housing 4 5, and with its gear "teeth 24 facing the openend of the housing. The face of' the gear 2-3 within the' teeth 24 is dished and provided with the rad-ially extending cutoiits 25. '1 he'-amount'of material removed' from the-face of the gear 23 is selected so Jthat the gear 23 will have the desired strength yet be relatively light 'inweight.

elosin g the-open-end I 7 of the housing 4 5 is a cover-"2 6 which is detachably secured to the housing 15 bymeans'of the circumferentially spaced bolts 2-! which areextended throng-b the outwardly proje'c-ting, radially disposed ears 28 of the cover 26 and reeeivedwithin theadjacent portions of the housing I5.

- 'Si' iitable means-are carried 'by the crown :gear 23 {and are engaged with 1 the adjacent :end of the drive shaman for operatively- -connecting the drive gear 2-3 to the drive shaft. Asclearly shown in Figure 4, the drivegear-isprovided with an axial aperture 29 which receives the adjacent portion of the drive shaft 20, the bounding wall of the aperture 29 being provided with a key 30 receivable within a keyway 3| provided longitudinally in the drive shaft 20. Positioned in end-to-end, spaced relation with respect to the bore-provided end of the drive shaft 20 is a threaded thrust and guide pin 32 which is threaded axially through the cover 26 for movement into and out of engagement with the drive shaft 20. As clearly shown in Figure 4, the pin 32 includes a threaded shank 33 and has its free end provided with a conicalextension 34 engageable with the terminating end of the bore 22. Circumposed about and supported upon of the spaced bearing sleeves 3B and 39 carried within the casing 36 contiguous to the ends thereof. It is to be noted that the casing 36, and the bearing sleeves 38 and 39 cooperate together to define a chamber 40 within the casing 36.

Disposed transversely of the casing 36 within the chamber 40 is a pinion 41 which is secured to the driven shaft 31. The pinion projects through a slot 42 provided in the coyer 26 and the adjacent portions of the casing 36 andhas its teeth 43 in meshing engagement with the ,radially extending teeth 24 of the drive gear 23.

Supported transversely of the projecting end of the driven shaft 31 is a grinding wheel 44. The grinding wheel or grindstone 44 is held against displacement on the drivenshaft 31 by means of the assembly of the cotter key 45 and the stop washer 46 which engage one face of the grinding wheel ,44 and the assembly of the stop washer 41 and the nut 48 which enga e the opposite face of the grinding wheel 44. The free end adjacent portion of the driven shaft 31 is threaded, as indicated by the reference numeral 49, for the support thereon of the threaded nut In actual use, the grinder attachment can be connected to the horizontally disposed power take-off 12 of the electric food mixer H, as shown in Figure l, or attached to the upwardly projecting, vertically disposed power take-off l3 of the mixer II, as shown in Figure 2. Upon starting the electric motor of the mixer H, the drive shaft 20 is rotated, whereuponthe grinding wheel 44 is rotated due to the operative connection between the drive shaft 20 and the grinding wheel. The grinding attachment of the present invention is particularly adapted for quick and easy dismantling for the replacement of worn or broken parts. Furthermore, the grinding wheel 44 can be detached from the driven shaft 31 by merely removing the threaded nut 48 from the shaft 31 and urging the grinding wheel 44 toward the free end of the driven shaft.

Although only oneembodiment of the grinding attachment of the present invention has been described, it is readily apparent that numerous modifications can be made without departing from the spirit of the invention as set forth in the appended claim.

what I claim is:

In a grinder attachment for a food mixer having a power take-off, a hollow cylindrical housing having a closed end and an open end, an axial extension on and projecting axially outwardly from said closed end of the housing, said extension being formed with a plain bore opening through said closed housing and into the interior of the housing, a plain drive shaft extending slidably' and rotatably through the extension bore, said drive shaft having an axially outward end projecting beyond the axially outward end of said extension and an axially inward end projecting into said housing, said axially outward end of the projection being adapted to be secured to the food mixer with the axially outward end of the drive shaft connected to the mixer power take-off, a crown'gear within said housing and fixed axially on the axially inward end of said drive shaft, said crown gear having gear teeth projecting toward the open end of the, housing and a face confronting the closedend of the housing whereby axial movement of the crown gear in the direction of the closed 'end of the housing is limited by contact thereof withthe closed end of the housing, a cover removablyv 'se-,

cured to said housing and closing the open end of said housing, the axially inward end of said drive shaft being formed with an axial socket, a thrust and guide pin threaded axially through said cover, said pin having an end rotatably engaging in said socket whereby axial movement of the crown gear in a direction toward the open endof the housing is limited, a casing fixed on the axially outward side of said cover and having bearing means extending radially with respect. to said housing, a driven shaft journaled insaid' bearings, said driven shaft having a radially'outward end extending beyond said casing and carrying a grinding wheel, said driven shaft. having a radially inward end terminating within said casing and carrying a pinion, said coverbeing formed with an opening communicating with the interior of said casing through which said pinion extends into mesh with the teeth of said crown gear, said cover, thrust and guide pin, driven shaft, pinion, and grinding wheel being thereby separable as a unit from said housing and drive shaft upon removal of the cover from the housing.

HARRY WOLBAUM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,417,228 Blocker May 23, 1922 2,006,510 Oxenhandler July 2, 1935 

